Magnetism for physics yay?

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kirchwey

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Lorentz force: F = qv X B, where X is the vector cross product.
Right-hand rule: Orient fingers such that they represent the smaller rotation of the first RHS cross-product term (qv, and remember sign of q is important) into the second RHS cross-product term (B). Then the extended thumb points along the product or LHS (F). See [1].
Earth's N pole is a magnetic S pole [2].The field +B points toward a magnetic S pole, thus toward geographic N. Charge q is positive and qv points E. Then, looking down at a map with the usual orientation of directions, when you orient the fingers correctly your thumb points up. Thus F is upward or away from earth.
q(proton) = 1.6022E-19 C
|F| = qvB = 8.8121E-19 N
 
A proton moves w a speed of 1x10^5 m/s through earths magnetic field, which has a value of 55 μT at a particular location. When the proton moves eastward, the magnetic force acting on it is directed straight upward, and when it moves northward, no magnetic force acts on it.
What is the direction of the magnetic feild and the strength of the magnetic force when the pron moves eastward?

-please explain how you can use the thumb rule to figure this out
 
Lorentz force: F = qv X B, where X is the vector cross product.
Right-hand rule: Orient fingers such that they represent the smaller rotation of the first RHS cross-product term (qv, and remember sign of q is important) into the second RHS cross-product term (B). Then the extended thumb points along the product or LHS (F). See [1].
Earth's N pole is a magnetic S pole [2].The field +B points toward a magnetic S pole, thus toward geographic N. Charge q is positive and qv points E. Then, looking down at a map with the usual orientation of directions, when you orient the fingers correctly your thumb points up. Thus F is upward or away from earth.
q(proton) = 1.6022E-19 C
|F| = qvB = 8.8121E-19 N
 
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